ONYX GemShoppy February 19, 2015 Gemstones Onyx is a symbol of eloquence. Onyx is known as sardonyx with white and brown bands. Onyx is a gemstone with alternating light and dark bands, which are colored in brown, red, black, white and grey. SiO2 Onyx is striped, semiprecious variety of the silica mineral agate with white and black, brown or red alternating bands. Its properties are the same as those of quartz. Sardonyx is the birthstone of Leo (Lion): July 23 – Aug 22. Onyx is the anniversary gemstone for the 7th year of marriage. Black Onyx is the anniversary gemstone for the 10th year of marriage. Varieties of onyx include carnelian onyx, with white and red bands, and sardonyx, with white and brown bands. Onyx may chip or scratch rather easily, so store onyx carefully and never allow two specimens to touch each other. From the stone history: The name onyx was used by the Romans for a variety of stones including alabaster, chalcedony, & what is now known as onyx marble. Cameos are cut from stones, such as onyx or agate, where different colours occur in layers. The background material is cut away, leaving the cameo design in relief. Onyx is also used in intaglios because its layers can be cut to show a colour contrast between the design and the background. Sardonyx at one time was more precious than gold, silver, or sapphire. Sardonyx is always widely used in cameos and intaglios. Onyx is a rich-looking, affordable gemstone. It is often mixed with pearls to create elegant jewellery. Treated agate is often sold as Black Onyx. Healing ability: Onyx is used as a heart, kidney, nerve, capillary, hair, eye and nail strengtheners. Onyx is said to help one sleep. This gemstone helps to eliminate apathy, stress and neurological disorders.